Wireless LAN Relay Frame Transmission for Coverage Expansion
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Solution Overview
Problem
Existing wireless LAN technologies face challenges in expanding service coverage without increasing transmission rate, particularly in sensor networks where data is transmitted over a wide area with a small number of access points, and existing relay technologies are not effective for transmitting data outside the transmission coverage of the transmit end.
Innovation Solution
A method and apparatus for transmitting relay frames in a wireless communication system using a handshaking protocol that includes a relay request frame, relay response frame, and relay frame, allowing data to be relayed from a transmit end to a receive end through a selected relay end, even if the receive end is outside the transmission area of the transmit end, using IEEE 802.11 MAC protocol and adjusting signal gain and compensating for carrier frequency offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay scheme is adopted to expand coverage, then the service area can be extended beyond the transmit end coverage, but the data transmission rate is reduced due to relayed transmission
Solution Approach 1:
The patent introduces a relay end as an intermediary device between the transmit end and receive end. The relay end receives data from the transmit end, processes it, and forwards it to the receive end, enabling extended coverage while managing transmission rate through the relay process
Solution Approach 2:
The transmission path is segmented into two separate links: transmit end to relay end, and relay end to receive end. This segmentation allows the system to extend coverage by breaking the direct transmission path into manageable segments that can be relayed through intermediate nodes
2Adaptability or versatility
If existing relay technologies are used in wireless LAN, then relay transmission can be established, but they cannot transmit data to receive ends outside the transmit end transmission coverage
Solution Approach 1:
The relay end acts as a mediator that bridges the coverage gap between transmit end and receive end. It establishes relay transmission by receiving control frames from the transmit end, selecting appropriate relay modes, and forwarding data to the receive end that would otherwise be outside direct coverage
Solution Approach 2:
The patent introduces a new dimension to wireless LAN communication by adding the relay end as an intermediate node in the transmission path. This creates a multi-hop transmission dimension that extends beyond the single-hop direct transmission coverage of traditional wireless LAN
3Area of stationary object
If channel coding scheme with low code rate is used to expand coverage, then coverage can be increased, but physical layer specification must be significantly modified
Solution Approach 1:
Instead of modifying the physical layer specification, the patent uses a relay end as an intermediary to extend coverage. The relay end receives signals within the transmit end's coverage range and forwards them to receive ends outside the original coverage area, avoiding the need for complex physical layer modifications
Solution Approach 2:
The relay end creates a copy of the transmission function by receiving data from the transmit end and independently forwarding it to the receive end. This copying approach extends coverage without requiring modifications to the original physical layer specification of the transmit end
Data Source
AI summary
A method and apparatus for transmitting a relay frame in a relay end are provided. The method includes: receiving a relay request frame requesting data transmission to a receive end from a transmit end; transmitting a relay response frame including information on data to be relayed to each of the transmit end and the receive end; receiving the data from the transmit end; and generating a relay frame including the data to transmit the relay frame to the receive end. According to the present invention, the data is transmitted to the receive end positioned outside a transmission coverage of the transmit end, such that a wireless LAN service coverage may be expanded, and an adjacent terminal connected to the receive end is used as the relay end, such that the transmit end that may not be connected directly to the receive end may communicate with the receive end.